To answer one of your questions about the rear ends. Some very early built 73 GTO's had an 8.5 rear with bolt in axles in them. My car came with one but it is now buried in my parents old back yard where the pool use to be. It had bolt in axles but I blew it up in DC when stationed there in 1976. It shows them in the old parts book if you have one from early 73 , but Pontiac went to all C-clip style axles after about 3 months of the build. They were built with the clutch style posi to. The only rear end that will bolt right in to the 73-77 A-bodies are just those, the earlier ones & later ones are a no go. Also the wagons are the same width.
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